I am using Chrome. In my dev tools console, I tried the following:
Everything works as expected except last line. Why can\'t I set currentTime
I ran into this problem after I'd started to use the PHP Server extension to VS Code to serve my HTML/PHP local testing. The problem was resolved for me by going back to my old Abysswebserver setup.
So, it's not simply that "you can't manipulate .currentTime on locally served files" but rather that "you need to pick a server that gives you the right headers". The Status entry for my file from AbyssWebserver, for example, read "Status Code: 206 Partial Content" while the one from PHP Server read "Status Code: 200 OK".
There are other differences though so there may be more to this than just the Status entry. See https://github.com/brapifra/vscode-phpserver/issues/85, for a full header comparison.